$f^{\prime}\left(x\right)=-\frac{2x\times\sin\left(x^{2}\right)}{\cos\left(x^{2}\right)}+\frac{3x}{\sqrt{3x^{2}+2}}$
$-2\cdot7+8$
$3^2-6mn+4m-8n$
$\left(2x^2+y^3\right).\left(2x^2+y^3\right)$
$\sqrt[6]{\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\left(x^4+1\right)+1};\:x=3$
$\sin\left(90+b\right)=\sin\left(90\right)\cdot\cos\left(b\right)+\cos\left(90\right)\cdot\sin\left(b\right)$
$4\left(a+b\right)$
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